Valve



2 SheetsSheet 1. T. P. FORD. VALVE.

' (No Model.)

Patented Jan; 1,1895.

INVENTOH aw/mm, ffi

AUORNEYS WITNESSES (No Model.) .2 Sheets-Sheet 2.

T. P. FORD. VALVE.

Patented Jan. 1,

WITNESSES: @206 v UNITED STATES PATENT lenient THOMAS P. FORD, OFBROOKLYN, NEW. YORK.

VALVE.

SPECIFICATION forming part of Letters Patent No. 531,917,:lated January1, 1895.

Application filed April 10, 1894 To all whom it Hwy concern.-

Be it known that I, THOMAS P. FORD, of Brooklyn, in the county of Kingsand State of New York, have invented new and useful Improvements inValves, of which the following is a full, clear, and exact description.

The invention relates to valves, such as shown and described in LettersPatent of the United States Nos. 489,799 and 503,843, granted to me onthe dates of January 10, 1893, and August 22, 1893, respectively.

The object of the present invention is to provide certain new and usefulimprovements in valves, whereby a sensitive action of the valve isobtained on the slightest variation of the fluid pressure.

The invention consists of certain parts and details, and combinations ofthe same, as will be fully described hereinafter and then pointed out inthe claims Reference is to be had to the accompanying drawings, forminga part of this specification, in which similar letters of referenceindicate corresponding parts in all the views.

Figure 1 is a sectional side elevation of the improvement. Fig. 2 is anenlarged sectional side elevation of the valve proper and its seat. Fig.3 is a side elevation, partly in section, of the improvement inconnection with a boiler.

The improved valve is provided with a valve body A, formed with a valveseat 13, dividing the body A into the compartments A and A of which theformer contains a valve O, adapted to be seated on the valve seat B soas to cut oft communication between the chainbers A and A the saidchambers being in communication with each other as long as the valve 0is unseated from the valve seat 13.

Into the chamber A leads a pipe D connected with a suitable source offluid pressure supply such as a water tank D, shown in Fig. 8, and inthe chamber A is fitted to slide a piston E, adapted to be moved in adownward direction by the fluid pressure passing through the pipe D, thechamber A, and the open valve sea-tB into the chamber A as will bereadily understood by reference to Fig. 1. On the under side of thepiston E is arranged a piston rod E, adapted to press a lever Fconnected with a regulating device of any approved construction, andserving to regulate and control the fluid pressure as hereinafter SerialNo. 507,014 (No model.)

more fully described. In the chamber A is arranged a drain opening A topermit the fluid pressure passing into the said compartment to drain outof the same whenever the valve O is seated on the seat B.

The escape openingA from the cylinder A is made smaller than the inletpipe D to the chamber A, so that fluid may enter the cylinders fasterthan it can escape, in order that a pressure may be maintained in thechamber A as long as the position of the valve 0 will permit the fluidto pass into the cylinder A faster than it can pass out.

The valve O is preferably of cylindrical cup shape, and is held on thelower end of a piston rod G extending upwardly and carrying at its upperend a piston G mounted to slide in a cylinder H, separated from thecompartment or chamber A by a partition O through which passes the saidpiston rod G',and which partition supports on its underside an annularflange O, in which is fitted to slide the cup-shaped valve 0.

Into the lower end of the cylinder H discharges a pipe I, connected witha suitable source of pressure supply, for instance, the steamcompartment R of a boiler R, in case the lever F is connected with adevice regulating the draft of the said boiler such as a damper, S, tocontrol the pressure of steam in the said boiler.

On the top of the piston G, presses a spring J, abutting with its upperend on a head K, controlled by a set screw L screwing in the top of thecylinder l'I, so that the said set screw regulates the tension of thespring J. On the top of the piston G also presses a light spring N,resting with its upper end on a disk 0' held on a rod 0 passing looselythrough the head K and the set screw L, to connect at its upper outerend with a lever I, fulcrumed on a bracket secured to the cylinder II.The lever P is pivotally connected with the lever F by a link Q providedwith a turnbuckle Q, so that when the lever is moved downward by theaction of the piston E, then the link Q is moved upward to actuate thelever P so as to press the rod 0 downward to compress the spring N, andthus exert an auxiliary pressure on the piston G.

In the bottom of the valve O are formed a number of openings 0 throughwhich the fluid passing into the chamber A can pass so as to equalizethe pressure on both sides of the said valve. The lower corner of thevalve O is rounded off, as at C see Fig. 2, whereby the valve inseating, touches the valve seat only in a circular line, whereby thevalve is rendered very highly sensitive.

The operation is as follows: In case the valve is used for regulating,for instance, a damper controlling the draft under a boiler, to regulatethe steam pressure of the boiler, and the several parts of the deviceare in their normal position, then the pressure of the spring J holdsthe valve 0 down on its seat (see Fig. 2), as long as the pressure inthe boiler is normal. The damper S is then open. When the boilerpressure increases, the piston G will be forced upward, so that thevalve 0 is moved in a like direction, and communication is establishedbetween the chambers A and A whereby the fluid in pipe D is allowed toact on the piston E to force it downward and actuate the damperregulating device to close the damper as shown in Figs. 1 and 3, thelever F being swung in the opposite direction to that of the arrow 0,.As soon as the pressure in the boiler again decreases, the pressure ofthe spring J will return the valve 0 to its seat, so as to relieve thepiston E from pressure. The damper regulating device is weighted asshown at W, or springcontrolled, and the said weight or its equivalentcauses the piston E to move upward, allowing the fluid to escape at Aand the damper is thus returned to its open position to increase thedraft. At the same time, the link Q by moving downward, produces anupward pull on the spring N and thereby facilitates the upward movementof the piston G and valve 0 when the pressure in the boiler againincreases. Thus by the connection of the link Q with the levers F and P,the rod 0 and spring N, I am enabled to start the piston G downwardly,so as to render the valve more sensitive. It is understood that thisvalve may be employed for various other purposes than the one mentioned.

pressure a piston arranged in the said chamber having the drain opening,the said piston being operatively connected with the said controllingmechanism to actuate the same, a'valve controlling the said valve seatto admit or cut off fluid-pressure to or from the said piston, acylinder and a piston therein,

the said piston being connected withthe said valve and the cylinderbeing provided with an inlet port connected with a separate andindependent supply of fluid under pressure, substantially as described.

2. The combination with a regulating device and mechanism forcontrolling the same, of two chambers separated by a valve seat, and onehaving a drain opening and the other being connected with a supply offluid under pressure, a piston arranged in the said chamber having thedrain opening the said piston being operatively connected with the saidcontrolling mechanism to actuate the same, a valve controlling the saidvalve seat to admit or cut off fluid pressure to or from the saidpiston, a cylinder and a piston therein, the said piston being connectedwith the said valve and the cylinder being provided with an inlet portconnected with a separate and independent supply of fluid underpressure, and a yielding connection between the said cylinder piston andthe said controlling mechanism to start the said piston downward and torender the said valve more sensitive, substantially as described.

THOMAS P. FORD.

\Vitnesses:

THEO. G. Hosrnn, C. SEDGVVICK.

